File system/directory monitoring utilities with loggin and task processing support (can execute files or make a WCF service call). Multiple configuration options. Source code libraries can be used to create a custom file system monitor.

BO2K is a remote administration tool for Windows systems. It comes with a client and a server. The server is lightweight and unobtrusive. A dynamic plugin architechture allows for easy system extension.
For those individuals that think there is a virus in the download see this link: http://www.bo2k.com/feedback.html

SyncDocs provides a simple point-and-click drag-and-drop HTTP server for transferring files between computers, or especially to applications on an iPhone. No DNS or IP settings are required: SyncDocs uses the Bonjour service discovery protocol.

JsUnit is a unit testing framework for client-side JavaScript in the tradition of the XUnit frameworks. Development began in 2001. As of 11/28/2009, development has moved to GitHub: http://github.com/pivotal/jsunit

SmartWin++ is a C++ template GUI library written to give the flexibility of the Windows API without the hassle and lack of typesafety that MFC/WTL delivers. A flexible, expandable abstraction of the Windows API (formerly Win32 API).

Visual Application Components Abstraction: A library to program applications for Windows using C++, STL and a simple OOP approach. It's a wrapper for the Win32 API, with additional functionality like dockable tool bars, layout managers, signal/slot,

An Enterprise Application Framework for .Net that produces an agile application from the data layer through to the front-end. Free open source under the LGPL license, it includes ORM and UI generation to create one application for the desktop & web.
Please note that the primary source repository is now at https://github.com/Chillisoft/habanero

The C++ programming framework that is compatiable with standard C++ libraries. Parts: the set of classes, templates and functions that provide safety interface; GUI; XML loader for a GUI structure. The project has been moved to http://cbear.berlios.de.

KalypsoBASE is a Desktop-GIS built on Eclipse. It's focus lies on modelling gis data using GML Application-Schemata. Features contain generic dialogs based on GML, maps based on OGC's SLD, and other tools like a charting framework or API for timeseries